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not bad for the price. Seem to wear out fairly fast, but compaired to other comparable sanding discs I would say they are acceptable.
I just went through over 50 boards of 80+ inch cedar, in three grades, and I only used about 10 sheets all combined. The vacuum draw that leaks around the inlet, sucks up that last 1% of the dust coming off the paper. Over time, even that is a consideration. The advantage to quality paper, is that you can get in a groove with some consistency. I simply attach a 2 1/2" vac hose to the dust port on my Bosch, which is way smaller than that, so a lot of air escapes.
That way you don't wind up with a buggered edge on your sander. It is still recommended to wear a mask because the shop vacs only capture to a micron or so. A fresh air system is even better. A good respirator, not a paper mask is advisable. I had a body shop for 20 years, and after using the cheaper paper on the random orbit sanders, and winding up with a floor full of used paper, I can attest to the savings of using quality, aluminum oxide paper. Additionally the backing paper is stiff enough to do the job. The 100, 120, and 150 are the most frequently used.To tell you the truth, I rarely use the 320.
That is about 3 for each grade. The 6 hole paper is nice for the dust free environment. Highly recommended. It is actually cheaper, in addition to doing a better job. When I first bought my Bosch 3727DVS, I bought a box of the popular grades; 80, 100, 120, 150, 180, 220, and 320. Instead of having cheaper paper that gives you the new disc agressiveness, then quickly to the used paper smoothness, which may be a grade finer, and miss the deeper lines from the coarser grade of paper in the previous step. So technically you have a vac system that is actually a mini-part of a micron, invisible dust manufacturing plant.
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